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Annotation of GNUtools/emacs/lisp/page.el, revision 1.1

1.1     ! root        1: ;; Page motion commands for emacs.
        !             2: ;; Copyright (C) 1985 Free Software Foundation, Inc.
        !             3: 
        !             4: ;; This file is part of GNU Emacs.
        !             5: 
        !             6: ;; GNU Emacs is free software; you can redistribute it and/or modify
        !             7: ;; it under the terms of the GNU General Public License as published by
        !             8: ;; the Free Software Foundation; either version 1, or (at your option)
        !             9: ;; any later version.
        !            10: 
        !            11: ;; GNU Emacs is distributed in the hope that it will be useful,
        !            12: ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: ;; GNU General Public License for more details.
        !            15: 
        !            16: ;; You should have received a copy of the GNU General Public License
        !            17: ;; along with GNU Emacs; see the file COPYING.  If not, write to
        !            18: ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
        !            19: 
        !            20: 
        !            21: (defun forward-page (&optional count)
        !            22:   "Move forward to page boundary.  With arg, repeat, or go back if negative.
        !            23: A page boundary is any line whose beginning matches the regexp  page-delimiter."
        !            24:   (interactive "p")
        !            25:   (or count (setq count 1))
        !            26:   (while (and (> count 0) (not (eobp)))
        !            27:     (if (re-search-forward page-delimiter nil t)
        !            28:        nil
        !            29:       (goto-char (point-max)))
        !            30:     (setq count (1- count)))
        !            31:   (while (and (< count 0) (not (bobp)))
        !            32:     (forward-char -1)
        !            33:     (if (re-search-backward page-delimiter nil t)
        !            34:        (goto-char (match-end 0))
        !            35:       (goto-char (point-min)))
        !            36:     (setq count (1+ count))))
        !            37: 
        !            38: (defun backward-page (&optional count)
        !            39:   "Move backward to page boundary.  With arg, repeat, or go fwd if negative.
        !            40: A page boundary is any line whose beginning matches the regexp  page-delimiter."
        !            41:   (interactive "p")
        !            42:   (or count (setq count 1))
        !            43:   (forward-page (- count)))
        !            44: 
        !            45: (defun mark-page (&optional arg)
        !            46:   "Put mark at end of page, point at beginning.
        !            47: A numeric arg specifies to move forward or backward by that many pages,
        !            48: thus marking a page other than the one point was originally in."
        !            49:   (interactive "P")
        !            50:   (setq arg (if arg (prefix-numeric-value arg) 0))
        !            51:   (if (> arg 0)
        !            52:       (forward-page arg)
        !            53:     (if (< arg 0)
        !            54:         (forward-page (1- arg))))
        !            55:   (forward-page)
        !            56:   (push-mark nil t)
        !            57:   (forward-page -1))
        !            58: 
        !            59: (defun narrow-to-page (&optional arg)
        !            60:   "Make text outside current page invisible.
        !            61: A numeric arg specifies to move forward or backward by that many pages,
        !            62: thus showing a page other than the one point was originally in."
        !            63:   (interactive "P")
        !            64:   (setq arg (if arg (prefix-numeric-value arg) 0))
        !            65:   (save-excursion
        !            66:     (widen)
        !            67:     (if (> arg 0)
        !            68:        (forward-page arg)
        !            69:       (if (< arg 0)
        !            70:          (forward-page (1- arg))))
        !            71:     ;; Find the end of the page.
        !            72:     (forward-page)
        !            73:     ;; If we stopped due to end of buffer, stay there.
        !            74:     ;; If we stopped after a page delimiter, put end of restriction
        !            75:     ;; at the beginning of that line.
        !            76:     (if (save-excursion (beginning-of-line)
        !            77:                        (looking-at page-delimiter))
        !            78:        (beginning-of-line))
        !            79:     (narrow-to-region (point)
        !            80:                      (progn
        !            81:                        ;; Find the top of the page.
        !            82:                        (forward-page -1)
        !            83:                        ;; If we found beginning of buffer, stay there.
        !            84:                        ;; If extra text follows page delimiter on same line,
        !            85:                        ;; include it.
        !            86:                        ;; Otherwise, show text starting with following line.
        !            87:                        (if (and (eolp) (not (bobp)))
        !            88:                            (forward-line 1))
        !            89:                        (point)))))
        !            90: 
        !            91: (defun count-lines-page ()
        !            92:   "Report number of lines on current page, and how many are before or after point."
        !            93:   (interactive)
        !            94:   (save-excursion
        !            95:     (let ((opoint (point)) beg end
        !            96:          total before after)
        !            97:       (forward-page)
        !            98:       (beginning-of-line)
        !            99:       (or (looking-at page-delimiter)
        !           100:          (end-of-line))
        !           101:       (setq end (point))
        !           102:       (backward-page)
        !           103:       (setq beg (point))
        !           104:       (setq total (count-lines beg end)
        !           105:            before (count-lines beg opoint)
        !           106:            after (count-lines opoint end))
        !           107:       (message "Page has %d lines (%d + %d)" total before after))))
        !           108: 
        !           109: (defun what-page ()
        !           110:   "Print page and line number of point."
        !           111:   (interactive)
        !           112:   (save-restriction
        !           113:     (widen)
        !           114:     (save-excursion
        !           115:       (beginning-of-line)
        !           116:       (let ((count 1)
        !           117:            (opoint (point)))
        !           118:        (goto-char 1)
        !           119:        (while (re-search-forward page-delimiter opoint t)
        !           120:          (setq count (1+ count)))
        !           121:        (message "Page %d, line %d"
        !           122:                 count
        !           123:                 (1+ (count-lines (point) opoint)))))))

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